Glenn Beck rally setting for new ad

Delaware Republican Christine O’Donnell is planning to capitalize on the throngs expected at Glenn Beck’s Washington rally Saturday by capturing footage for a television ad she hopes to launch against Rep. Mike Castle in their Senate primary.

O’Donnell, a heavy underdog against the moderate nine-term congressman, told POLITICO Friday that her campaign will shoot footage of her among the estimated 2,000 Delaware residents attending the conservative demonstration.

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While there were no confirmed plans on when — or even if — the ad would run, O’Donnell campaign manager Matt Moran said, “When the liquidity comes, it comes. You’ll see some things next week breaking.”

Beck has billed his “Restoring Honor” event as apolitical and a tribute to the military, but O’Donnell said the commercial was what her supporters were most excited about.

Though she has won backing from the Tea Party Express and the anti-abortion Susan B. Anthony List, O’Donnell acknowledged her biggest hurdle in the remaining two and a half weeks is amping up her profile in a small state that has sent Castle back to Washington consistently since 1992.

“Our biggest challenge right now is not enough Republican voters know about this primary,” she said.

She complained that Castle has turned down most joint appearances with her — including a televised debate — but remained optimistic that his voting record, coupled with the volatile political environment, could make her the next Joe Miller, the tea party candidate who is leading Alaska Sen. Lisa Murkowski with absentee ballots yet to be counted.

“He has the audacity to vote with Barack Obama on every major bill this summer and then not show up to Republican forums to explain himself. That alone is rubbing voters the wrong way,” she said.

Moran also lamented the influence of establishment Republicans in backing Castle, including the endorsement from the National Republican Senate Committee (NRSC).